Each waived their right to a speedy trial, agreeing to continue the case to April 2 to set a preliminary hearing.

Both Krueger and Warner remain in custody without bail.

Lieberstein said the Napa County sheriff-coroner has issued a cause of death in the case "basically corroborating" early suspicion that the toddler died from "multiple blunt impact injuries to the head, torso and extremities due to fatal child abuse and neglect." He declined further comment.

"We will continue to evaluate evidence and review reports as they come in," Lieberstein said. "And if there is a basis for amending or adding charges down the road we'll deal with it at such time."

Krueger and Warner have been charged with murder and "assault on a child causing death" in the alleged killing of Krueger's daughter, Kayleigh Slusher.

Police found the girl's lifeless body in the mother's Napa apartment on Feb. 1 after responding to an anonymous tipster's call for a welfare check. It was the third time in a week authorities had responded to the address on reports of possible child abuse.

Krueger and Warner, who weren't home when police arrived, were arrested the following day after being spotted near an El Cerrito BART station.

According to police, they each allegedly admitted that the girl was found dead by "unknown circumstances" and for three days they stored her body in a suitcase and then placed the body in a freezer.